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Plant residues are widely used in the Great Central Plains of North America as a trash cover (stubble mulch) to protect soil from wind. The protection provided varies with the quantity of residue on the soil surface (6, 8). Maximum conservation of surface residue is generally required on summerfallowed land. The conservation of residue by various tillage machines, and some factors influencing conservation, have been re ported (1, 2, 3, 4, 7). These reports discuss residue conservation quantitatively but not qualitatively.Qualitative factors, such as orientation and anchorage to soil, influence the usefulness of residue for erosion control. Residue that is well anchored resists movement by wind, and tillage and seeding machines pass through it with less difficulty than when it is loose on the soil. Residue positioned vertically or at some angle to the soil surface provides greater erosion protection than an equal quantity of residue positioned horizontally (6). The capability of tillage machines to conserve surface residue and to maintain the anchorage and vertical positioning of the residue is important.
some qualitative effects of tillage machines on plant residues used for erosion control
Anderson, D. T. 1968. SOME QUALITATIVE EFFECTS OF TILLAGE MACHINES ON PLANT RESIDUES USED FOR EROSION CONTROL. Canadian Agricultural Engineering 10(2):53-56.
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